Not quite sure if this is the right group but we are experiencing some weird issues with the VoIP phones after swapping out a 1700 series router with a newer 2821 router.
What is happening is that the 7940 phones keep rebooting or just not allowing users to answer a ringing phone.
The configuration is the same on the new router as the old router and there are no errors reported by the router or switches.
Any ideas on why this may be happening?
On the original 1760 router there were no problems.
Also upgraded the IOS on the 2821 to the latest version and that didn't seem to help.